3. Leg raises
Leg raises is another exercise to slim your waist. Lie flat on the floor with your hands flat at your sides and your legs together. Raise your feet, keep your knees straight, and hold them 30 seconds or a minute.
You can also do leg raises while sitting straight up sideways on a bench with your hands behind you and raising your legs together. Do 2 sets of 12 to 15 reps.